-22.34% is the change from 828 to 643
Calculation steps:
[( 643 - 828 ) ÷ 828] x 100 = -22.34%
Formula
Percentage change = [(643 - 828) / 828] x 100
Subtract the new number by the original number
643 - 828 = -185
-185 ÷ 828 = -0.22342995169082125
-0.22342995169082125 x 100 = -22.34%